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Dudash <br />January 8, 2010 <br />Page 3 <br />saturated zone(s) above the coal seam(s) down gradient of both the main entries beneath <br />Terror Creek and North Mains mine plan areas. The Hydrologic Monitoring Plan, permit <br />text and tables should be updated accordingly. <br />2. Please update the permit document to expand the discussion regarding the hydraulic <br />isolation of the Rollins sandstone to include the area beneath Terror Creek at the west end <br />of the permit boundary. BRL should make the case that similar conditions exist and no <br />additional monitoring is necessary in the Rollins sandstone at the west end of the permit <br />boundary where new disturbance is proposed with TR-65 (main entries beneath Terror <br />Creek and North Mains Rooms). To the extent practicable please update appropriate maps <br />and cross-sections with available geotechnical data or drill log information to demonstrate <br />the hydraulic isolation of the Rollins sandstone. <br />The proposed geotechnical hole which would be located by monitoring well TC-03-01 is <br />described in the cover letter to the application. Based on discussion with J.E. Stover & <br />Associates the geotechnical hole is in the same location as the ventilation shaft being <br />proposed for TR-66. It is unclear whether BRL will abandon the geotechnical hole prior to <br />vent shaft installation. Please describe the abandonment plans for the geotechnical hole and <br />how this will be coordinated with ventilation shaft construction. <br />4. A dip-slip fault is known to exist within the permit boundary in the immediate area of the <br />proposed main entries beneath Terror Creek. The strike and the displacement of the fault <br />are shown on Map 08 of the permit application. Based on review of available information it <br />appears that the fault will be encountered at the First Quarter 2010 main entry located to the <br />east of Terror Creek. Significant quantities of water from mine inflow may be encountered <br />at the fault location during mining of the main entries. If available, please provide the <br />Division with an estimate of the quantity of mine inflow water that could potentially be <br />encountered due to development mining across the fault location. Please provide revised <br />text describing BRL's plan for controlling and handling the water, if significant amounts of <br />mine inflow are encountered. <br />Please let me know if you have any questions regarding my review of TR-65. <br />c: Sandy Brown